Number Line while reading by chunks

ambs has asked for the wisdom of the Perl Monks concerning the following question:

Hello.

When we use a different record separator (for instance, an empty new line), the variable dollar dot ($.) does not count the number of lines read, but the number of chunks read.

My question is if there is any automatic method to get the line number where a chunk starts (I know, and I am able to do it manually. Just to be sure I am not re-inventing the wheel).

Thanks,

Alberto Simões

Comment on Number Line while reading by chunks

Replies are listed 'Best First'.
Re: Number Line while reading by chunks by massa (Hermit) on Aug 18, 2008 at 11:20 UTC
Olá, Alberto. in short, no -- you have `$.`, the current record number, and the result of `tell`, the current byte number. Maybe it would be better to trust perl's buffering and code your thing in a line-oriented way?? (just a suggestion, of course...) []s, HTH, Massa (κς,πμ,πλ)	[reply] [d/l] [select]
Re: Number Line while reading by chunks by JavaFan (Canon) on Aug 18, 2008 at 11:43 UTC
$. always counts the number of chunks read. It's just that by default the chunks happen to be lines.	[reply]
Re: Number Line while reading by chunks by Perlbotics (Archbishop) on Aug 18, 2008 at 11:52 UTC
Maybe the easiest way is to count the lines on your own? `perl -ne 'BEGIN {our $n=1; $/="";}; print "=Line:$n, Record:$.==\n$_"; + $n += y/\n/\n/;'< textfile` [download] Update: Oops, missed something when doing the test. Code above corrected. This was formerly `perl -ne '$/=""; $F{1} += y/\n/\n/ -1; print "=Line:",$F{1},", Record: $.==\n$_==\n"; ' < textfile` Sorry for that.	[reply] [d/l]
Re^2: Number Line while reading by chunks by ambs (Pilgrim) on Aug 22, 2008 at 18:22 UTC
Yup, that was what I was thinking on. But you know, Perl has so many variables and tweaks, that I might be forgetting something. Thanks ;) Alberto Simões	[reply]


good chemistry is complicated, and a little bit messy -LW
	PerlMonks